Z04.1 vs Z04.2
Z04.1 and Z04.2 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on Z04.1
encounter for examination and observation following work accident (Z04.2)
Z04.1
Encounter for examination and observation following transport accident
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z00-Z13
Indexed under
- Examination › following › motor vehicle accident (for) (following) (general) (of) (routine)
- Observation › accident NEC › transport (following) (for) (without need for further medical care)
- Examination › following › accident NEC › transport (for) (following) (general) (of) (routine)
Z04.2
Encounter for examination and observation following work accident
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z00-Z13
Indexed under
- Observation › following work accident (following) (for) (without need for further medical care)
- Observation › accident NEC › at work (following) (for) (without need for further medical care)
- Observation › suspected, ruled out › accident at work (following) (for) (without need for further medical care)
- Examination › following › accident NEC › work (for) (following) (general) (of) (routine)
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027